Apparatus for spraying an air-water mist cooling for use in continuous metal casting

Abstract

An exhaust hole is formed in an exhaust side wall of a mist atomizing nozzle of an apparatus for spraying the mist for cooling for and is used in continuous metal casting. An introduction inlet is provided in an introducing side wall on the side opposite the exhaust side wall at the height position different from that of the exhaust hole. An air-water mixture supply pipe is attached to the introduction inlet to communicate therewith. The air-water mixture of relatively large water droplets is formed and is introduced into the mist atomizing nozzle by that air-water mixture supply pipe. After the air-water mixture repeatedly collides in the mist atomizing nozzle, the large water droplets are made fine and are sequentially exhausted from the exhaust hole by being pressed by the supply pressure from the rear side.

What is claimed is: 
     
       1. An apparatus for spraying an air-water mist for cooling a cast strand in continuous metal casting in which a mist atomizing nozzle is utilized which is attached to a head portion of an air-water mixture supply pipe, said apparatus comprising: exhaust means formed in an exhaust side wall of said mist atomizing nozzle; and   introduction inlet means provided in an introduction side wall at a height position different from that of said exhaust means wherein a distance l between a central axis of said introduction inlet means and a central line passing through a midpoint of said exhaust means parallel to said central axis is set at a predetermined value so as to satisfy the following relation,   1/2d<l≦2.5D        wherein d is an inside diameter of the introduction inlet means and D is a distance from the introduction side wall of said mist atomizing nozzle to the exhaust side wall.   
     
     
       2. A mist spraying apparatus according to claim 1, wherein said mist atomizing nozzle further comprises a cylindrical nozzle having opposite ends which are closed. 
     
     
       3. A mist spraying apparatus according to claim 1, wherein said exhaust means further comprises a slit-like shaped hole formed in said exhaust side wall of said nozzle parallel to a diameter direction thereof. 
     
     
       4. A mist spraying apparatus according to claims 1 or 2, wherein said exhaust means includes a plurality of dot-hole-like shaped holes formed in said exhaust side wall of said nozzle. 
     
     
       5. A mist spraying apparatus according to claim 3, wherein said slit-like exhaust hole further comprises a cut surface portion of said exhaust wall which is parallel to both a central tangetial line of said exhaust hole and the central line of said nozzle. 
     
     
       6. A mist spraying apparatus according to claim 3, wherein said slit-like exhaust hole further comprises a cut surface portion of said exhaust wall which forms a fan like opening from a point in the mist atomizing nozzle on the central line perpendicular to a central tangential line.